mirror of
https://github.com/k3s-io/kubernetes.git
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310 lines
11 KiB
Go
310 lines
11 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package e2e_node
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"strings"
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"time"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/client/restclient"
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client "k8s.io/kubernetes/pkg/client/unversioned"
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"k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/stats"
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"github.com/davecgh/go-spew/spew"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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var _ = Describe("Kubelet", func() {
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var cl *client.Client
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BeforeEach(func() {
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// Setup the apiserver client
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cl = client.NewOrDie(&restclient.Config{Host: *apiServerAddress})
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})
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Describe("pod scheduling", func() {
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namespace := "pod-scheduling"
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Context("when scheduling a busybox command in a pod", func() {
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podName := "busybox-scheduling"
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It("it should return succes", func() {
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pod := &api.Pod{
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ObjectMeta: api.ObjectMeta{
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Name: podName,
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Namespace: namespace,
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},
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Spec: api.PodSpec{
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// Force the Pod to schedule to the node without a scheduler running
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NodeName: *nodeName,
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// Don't restart the Pod since it is expected to exit
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RestartPolicy: api.RestartPolicyNever,
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Containers: []api.Container{
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{
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Image: "gcr.io/google_containers/busybox",
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Name: podName,
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Command: []string{"sh", "-c", "echo 'Hello World' ; sleep 240"},
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},
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},
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},
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}
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_, err := cl.Pods(namespace).Create(pod)
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Expect(err).To(BeNil(), fmt.Sprintf("Error creating Pod %v", err))
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})
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It("it should print the output to logs", func() {
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Eventually(func() string {
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sinceTime := unversioned.NewTime(time.Now().Add(time.Duration(-1 * time.Hour)))
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rc, err := cl.Pods(namespace).GetLogs(podName, &api.PodLogOptions{SinceTime: &sinceTime}).Stream()
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if err != nil {
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return ""
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}
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defer rc.Close()
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buf := new(bytes.Buffer)
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buf.ReadFrom(rc)
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return buf.String()
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}, time.Minute, time.Second*4).Should(Equal("Hello World\n"))
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})
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It("it should be possible to delete", func() {
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err := cl.Pods(namespace).Delete(podName, &api.DeleteOptions{})
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Expect(err).To(BeNil(), fmt.Sprintf("Error deleting Pod %v", err))
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})
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})
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Context("when scheduling a read only busybox container", func() {
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podName := "busybox-readonly-fs"
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It("it should return success", func() {
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isReadOnly := true
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pod := &api.Pod{
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ObjectMeta: api.ObjectMeta{
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Name: podName,
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Namespace: namespace,
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},
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Spec: api.PodSpec{
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// Force the Pod to schedule to the node without a scheduler running
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NodeName: *nodeName,
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// Don't restart the Pod since it is expected to exit
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RestartPolicy: api.RestartPolicyNever,
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Containers: []api.Container{
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{
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Image: "gcr.io/google_containers/busybox",
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Name: podName,
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Command: []string{"sh", "-c", "echo test > /file; sleep 240"},
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SecurityContext: &api.SecurityContext{
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ReadOnlyRootFilesystem: &isReadOnly,
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},
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},
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},
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},
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}
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_, err := cl.Pods(namespace).Create(pod)
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Expect(err).To(BeNil(), fmt.Sprintf("Error creating Pod %v", err))
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})
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It("it should not write to the root filesystem", func() {
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Eventually(func() string {
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rc, err := cl.Pods(namespace).GetLogs(podName, &api.PodLogOptions{}).Stream()
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if err != nil {
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return ""
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}
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defer rc.Close()
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buf := new(bytes.Buffer)
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buf.ReadFrom(rc)
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return buf.String()
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}, time.Minute, time.Second*4).Should(Equal("sh: can't create /file: Read-only file system\n"))
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})
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It("it should be possible to delete", func() {
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err := cl.Pods(namespace).Delete(podName, &api.DeleteOptions{})
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Expect(err).To(BeNil(), fmt.Sprintf("Error creating Pod %v", err))
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})
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})
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})
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Describe("metrics api", func() {
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namespace := "kubelet-metrics-api"
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statsPrefix := "stats-busybox-"
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podNames := []string{}
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podCount := 2
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for i := 0; i < podCount; i++ {
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podNames = append(podNames, fmt.Sprintf("%s%v", statsPrefix, i))
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}
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BeforeEach(func() {
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for _, podName := range podNames {
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createPod(cl, podName, namespace, []api.Container{
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{
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Image: "gcr.io/google_containers/busybox",
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Command: []string{"sh", "-c", "while true; do echo 'hello world' | tee ~/file | tee /test-empty-dir-mnt ; sleep 1; done"},
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Name: podName + containerSuffix,
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VolumeMounts: []api.VolumeMount{
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{MountPath: "/test-empty-dir-mnt", Name: "test-empty-dir"},
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},
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},
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}, []api.Volume{
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// TODO: Test secret volumes
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// TODO: Test hostpath volumes
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{Name: "test-empty-dir", VolumeSource: api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{}}},
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})
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}
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// Sleep long enough for cadvisor to see the pod and calculate all of its metrics
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// TODO: Get this to work with polling / eventually
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time.Sleep(time.Minute * 2)
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})
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Context("when querying /stats/summary", func() {
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It("it should report resource usage through the stats api", func() {
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By("Returning stats summary")
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resp, err := http.Get(*kubeletAddress + "/stats/summary")
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Expect(err).To(BeNil(), fmt.Sprintf("Failed to get /stats/summary"))
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summary := stats.Summary{}
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contentsBytes, err := ioutil.ReadAll(resp.Body)
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Expect(err).To(BeNil(), fmt.Sprintf("Failed to read /stats/summary: %+v", resp))
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contents := string(contentsBytes)
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decoder := json.NewDecoder(strings.NewReader(contents))
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err = decoder.Decode(&summary)
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Expect(err).To(BeNil(), fmt.Sprintf("Failed to parse /stats/summary to go struct: %+v", resp))
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By("Having resources for node")
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Expect(summary.Node.NodeName).To(Equal(*nodeName))
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Expect(summary.Node.CPU.UsageCoreNanoSeconds).NotTo(BeNil())
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Expect(*summary.Node.CPU.UsageCoreNanoSeconds).NotTo(BeZero())
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Expect(summary.Node.Memory.UsageBytes).NotTo(BeNil())
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Expect(*summary.Node.Memory.UsageBytes).NotTo(BeZero())
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Expect(summary.Node.Memory.WorkingSetBytes).NotTo(BeNil())
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Expect(*summary.Node.Memory.WorkingSetBytes).NotTo(BeZero())
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Expect(summary.Node.Fs.AvailableBytes).NotTo(BeNil())
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Expect(*summary.Node.Fs.AvailableBytes).NotTo(BeZero())
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Expect(summary.Node.Fs.CapacityBytes).NotTo(BeNil())
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Expect(*summary.Node.Fs.CapacityBytes).NotTo(BeZero())
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Expect(summary.Node.Fs.UsedBytes).NotTo(BeNil())
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Expect(*summary.Node.Fs.UsedBytes).NotTo(BeZero())
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By("Having resources for kubelet and runtime system containers")
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sysContainers := map[string]stats.ContainerStats{}
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sysContainersList := []string{}
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for _, container := range summary.Node.SystemContainers {
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sysContainers[container.Name] = container
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sysContainersList = append(sysContainersList, container.Name)
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ExpectContainerStatsNotEmpty(&container)
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}
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Expect(sysContainersList).To(ContainElement("kubelet"))
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Expect(sysContainersList).To(ContainElement("runtime"))
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// Verify Pods Stats are present
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podsList := []string{}
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By("Having resources for pods")
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for _, pod := range summary.Pods {
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if !strings.HasPrefix(pod.PodRef.Name, statsPrefix) {
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// Ignore pods created outside this test
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continue
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}
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podsList = append(podsList, pod.PodRef.Name)
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Expect(pod.Containers).To(HaveLen(1))
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container := pod.Containers[0]
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Expect(container.Name).To(Equal(pod.PodRef.Name + containerSuffix))
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ExpectContainerStatsNotEmpty(&container)
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// emptydir volume
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volumeNames := []string{}
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for _, vs := range pod.VolumeStats {
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Expect(vs.CapacityBytes).NotTo(BeZero())
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Expect(vs.AvailableBytes).NotTo(BeZero())
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Expect(vs.UsedBytes).NotTo(BeZero())
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volumeNames = append(volumeNames, vs.Name)
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}
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Expect(volumeNames).To(ConsistOf("test-empty-dir"))
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// fs usage (not for system containers)
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Expect(container.Rootfs).NotTo(BeNil(), spew.Sdump(container))
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Expect(container.Rootfs.AvailableBytes).NotTo(BeNil(), spew.Sdump(container))
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Expect(*container.Rootfs.AvailableBytes).NotTo(BeZero(), spew.Sdump(container))
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Expect(container.Rootfs.CapacityBytes).NotTo(BeNil(), spew.Sdump(container))
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Expect(*container.Rootfs.CapacityBytes).NotTo(BeZero(), spew.Sdump(container))
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Expect(container.Rootfs.UsedBytes).NotTo(BeNil(), spew.Sdump(container))
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Expect(*container.Rootfs.UsedBytes).NotTo(BeZero(), spew.Sdump(container))
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Expect(container.Logs).NotTo(BeNil(), spew.Sdump(container))
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Expect(container.Logs.AvailableBytes).NotTo(BeNil(), spew.Sdump(container))
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Expect(*container.Logs.AvailableBytes).NotTo(BeZero(), spew.Sdump(container))
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Expect(container.Logs.CapacityBytes).NotTo(BeNil(), spew.Sdump(container))
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Expect(*container.Logs.CapacityBytes).NotTo(BeZero(), spew.Sdump(container))
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Expect(container.Logs.UsedBytes).NotTo(BeNil(), spew.Sdump(container))
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Expect(*container.Logs.UsedBytes).NotTo(BeZero(), spew.Sdump(container))
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}
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Expect(podsList).To(ConsistOf(podNames), spew.Sdump(summary))
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})
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})
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AfterEach(func() {
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for _, podName := range podNames {
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err := cl.Pods(namespace).Delete(podName, &api.DeleteOptions{})
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Expect(err).To(BeNil(), fmt.Sprintf("Error deleting Pod %v", podName))
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}
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})
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})
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})
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func ExpectContainerStatsNotEmpty(container *stats.ContainerStats) {
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// TODO: Test Network
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Expect(container.CPU).NotTo(BeNil(), spew.Sdump(container))
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Expect(container.CPU.UsageCoreNanoSeconds).NotTo(BeNil(), spew.Sdump(container))
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Expect(*container.CPU.UsageCoreNanoSeconds).NotTo(BeZero(), spew.Sdump(container))
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Expect(container.Memory).NotTo(BeNil(), spew.Sdump(container))
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Expect(container.Memory.UsageBytes).NotTo(BeNil(), spew.Sdump(container))
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Expect(*container.Memory.UsageBytes).NotTo(BeZero(), spew.Sdump(container))
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Expect(container.Memory.WorkingSetBytes).NotTo(BeNil(), spew.Sdump(container))
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Expect(*container.Memory.WorkingSetBytes).NotTo(BeZero(), spew.Sdump(container))
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}
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const (
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containerSuffix = "-c"
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)
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func createPod(cl *client.Client, podName string, namespace string, containers []api.Container, volumes []api.Volume) {
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pod := &api.Pod{
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ObjectMeta: api.ObjectMeta{
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Name: podName,
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Namespace: namespace,
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},
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Spec: api.PodSpec{
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// Force the Pod to schedule to the node without a scheduler running
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NodeName: *nodeName,
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// Don't restart the Pod since it is expected to exit
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RestartPolicy: api.RestartPolicyNever,
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Containers: containers,
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Volumes: volumes,
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},
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}
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_, err := cl.Pods(namespace).Create(pod)
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Expect(err).To(BeNil(), fmt.Sprintf("Error creating Pod %v", err))
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}
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